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| Registros recuperados: 138 | |
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| Louis, Garrick; Shih, Jhih-Shyang. |
| Most of the United States have laws mandating the recycling of municipal solid waste (MSW). In order to comply, municipalities recycle quotas of materials, without regard to fluctuating prices. An inventory system is proposed that allows municipalities to be sensitive to materials prices as they recycle in accordance with state mandates. A dynamic model is developed; it uses historical secondary material prices as exogenous inputs to minimize the net present value of MSW recycling system cost. The model provides a cost-effective method for municipalities to achieve their MSW recycling targets. The savings is approximately $1.43 per ton of MSW generated based on total MSW management costs of $13.5 per ton. The model also allows one to investigate the... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Municipal solid waste; Recycling; Inventory; Optimization; Environmental Economics and Policy; Q2. |
| Ano: 2002 |
URL: http://purl.umn.edu/10459 |
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| Stinner, Walter; Möller, Kurt; Leithold, Günter. |
| Problemstellung/Ziele:Analog zur Entwicklung im konventionellen Landbau ist auch im Ökologischen Landbau eine zunehmende Tendenz zu viehloser Wirtschaftsweise festzustellen. Viehlose Betriebe können auf die Vorteile des Kleegrasanbaues (N-Versorgung, Unkrautbekämpfung) kaum verzichten. Üblicherweise wird der Aufwuchs gemulcht und auf der Fläche belassen, ebenso die übrigen Rest- und Koppelprodukte (Stroh von Getreide und Körnerleguminosen, Zwischenfruchtaufwüchse, u.ä.). Damit können erhebliche N-Verluste verbunden sein, zum Einen als Ammoniakfreisetzungen beim Abbau des Kleegrasmulches (u.a. ANDREN, 1987), zum Anderen durch Minderleistungen der Stickstofffixierung gemulchter Bestände, die mineralisierten Stickstoff aufnehmen und dabei die eigene... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Recycling; Balancing and resource management Composting and manuring Air and water emissions. |
| Ano: 2003 |
URL: http://orgprints.org/4528/1/4528%2Dstinner%2D2003%2Dbiogas.pdf |
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| Kahiluoto, H.; Bäckman, S.; Hannula, A.; Kakriainen, S.; Krumalowa, V.; Kuisma, M.; Lehto, T.; Mikkola, M.; Sumelius, J.; Seuri, P.; Vihma, A.; Granstedt, A.. |
| The aim of the study was to determine the potential, impact and prerequisites of localization and enhanced recycling in a rural food system, illustrated by the case of Juva milk. An interdisciplinary scenario based on the increase of local, organic milk to 50 % of milk comsumption was created and the sustainability was compared, on the basis of the statistics and data collected from the actors, with the present milk system. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Recycling; Balancing and resource management. |
| Ano: 2005 |
URL: http://orgprints.org/5220/1/5220.pdf |
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| Thomsen, MH; Tajoacha, N; Wu, C; Hovgaard, S; Houmøller, LP; Holm-Nielsen, JB; Thomsen, AB. |
| The most well-known way to produce bioethanol is by the enzymatic hydrolysis and fermentation of starch. In a new project “BioConcens” (2007) sponsored by DARCOF (DAnish Research Center for Organic Food and farming) one aim is to develop a combined ethanol and biogas production for use in organic farming using starch containing biomass. Natural enzymes from cereals will be used for hydrolysis of starch to glucose in accordance with technology in brewing technology. Commercial enzymes are often produced from gene-modified organisms and will therefore not be used in the suggested organic context or process. A preliminary study was performed in which grains of wheat, rye, and barley were germinated using traditional methods applied in malting for beer... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Recycling; Balancing and resource management. |
| Ano: 2007 |
URL: http://orgprints.org/11302/1/Germinated_grain_29th_symp_Denver_2007.pdf |
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| Szerencsits, Manfred; Erhart, Eva. |
| Cover or catch crops have beneficial effects for soil, water, erosion, etc. If harvested, they also provide feedstock for biogas without competition for arable land. The latter also applies to clover grass ley or other residues on organic farms without ruminants and for manure. With an explorative approach, combining field experiments and data collection of practical implementation, we investigated achievable yields and identified recommendations for practical use. Gross energy yields of cover crops varied between 700 and 2000 m³ methane (CH4) ha-1 in Austria. The energy return on energy invested (EROI) ranges from 4 to 7, if biogas is upgraded and com¬pressed for biofuel use. Therefore, about 1000 m³ CH4 ha-1 are remaining as net energy yield from 4.5 t... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Recycling; Balancing and resource management Crop husbandry Soil Environmental aspects. |
| Ano: 2015 |
URL: http://orgprints.org/27238/1/27238_szerencsits.pdf |
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| Möller, Dr. Kurt; Stinner, Walter; Deuker, Arno; Leithold, Prof. Dr. Günter. |
| In two agricultural systems with and without animal husbandry the potential to produce renewable energy by digesting slurry and organic residues to biogas were assessed. In comparison to some other methods of energy production by biomass biogas production has the advantage of keeping the nutrients of the substrates within the agricultural system. They can be used as fertilisers. In the investigated system with milk production (0,8 cows ha-1, 8 crops, among them 4 cereals, peas, potatoes and 2 clover grasses with catch crops after winter cereals and peas (see DEUKER et al. 2005), it is possible not only to ferment slurry, but also catch crops and straw of peas and cereals. The methan production potential by digesting only slurry is the equivalent of around... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Recycling; Balancing and resource management Composting and manuring Air and water emissions. |
| Ano: 2005 |
URL: http://orgprints.org/3706/1/3706.pdf |
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| Jørgensen, Uffe; Dalgaard, Tommy; Kristensen, Erik Steen. |
| One of the aims of organic farming is to “reduce the use of non-renewable resources (e.g. fossil fuels) to a minimum”. So far, however, only very little progress has been made to introduce renewable energy in organic farming. This paper presents energy balances of Danish organic farming compared with energy balances of conventional farming. In general, the conversion to organic farming leads to a lower energy use (approximately 10% per unit of product). But the production of energy in organic farming is very low compared with the extensive utilisation of straw from conventional farming in Denmark (energy content of straw used for energy production was equivalent to 18% of total energy input in Danish agriculture in 1996). Biomass is a key energy carrier... |
| Tipo: Journal paper |
Palavras-chave: Recycling; Balancing and resource management. |
| Ano: 2005 |
URL: http://orgprints.org/3959/1/3959_Biomass.pdf |
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| Kraus, Marina. |
| Schafwolle ist ein nachwachsender Rohstoff mit besonderen Eigenschaften. Die Naturfaser ist erneuerbar, biologisch abbaubar, energieeffizient, atmungsaktiv, feuchtigkeitsregulierend, kaum allergen, luftreinigend, lärmdämmend, schwer entflammbar, UV-Licht abwesend, wenig statisch aufgeladen und sehr hitzebeständig. Das Merkblatt entstand im Rahmen einer Semesterarbeit an der ZHAW und zeigt, wo Bioschafwolle wie eingesetzt werden kann und wo Handlungsbedarf besteht. |
| Tipo: Book |
Palavras-chave: Recycling; Balancing and resource management Sheep and goats. |
| Ano: 2014 |
URL: http://orgprints.org/28481/1/1648-bioschafwolle.pdf |
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| Nascimento, Alexandre Ferreira do. |
| Muitos sistemas de produção contam basicamente com os nutrientes provenientes da decomposição de materiais orgãnicos adicionados ao solo. A taxa de decomposição desses materiais é produto da combinação de fatores intrinsecos, sua composição quimica e bioquímica, e fatores extrínsecos, sendo as condições de temperatura e umidade do local as variáveis mais importantes, constituindo assim em um processo complexo e dinâmico por ser controlado por vários fatores. Contudo, a decomposição pode ser representada e examinada dentro de esquemas e mecanismos que facilitam seu entendimento, os modelos matemáticos. Dessa forma, o objetivo deste trabalho foi calibrar e validar os modelos Centry, APSIM e NDICEA para decomposição e liberação de N em condições climáticas... |
| Tipo: Thesis |
Palavras-chave: Recycling; Balancing and resource management Specific methods. |
| Ano: 2008 |
URL: http://orgprints.org/21844/1/Nascimento_Calibracao.pdf |
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| Registros recuperados: 138 | |
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